Parabolic cylindrical antenna device based on a fully rotating subframe structure with an equal-sized flower disk

Abstract

This invention provides a parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disc, relating to the field of space deployable antenna manufacturing. It includes an upper curved deployable mechanism and a lower curved deployable mechanism arranged opposite each other. The upper curved deployable mechanism is rotatably connected to the lower curved deployable mechanism via a strut, forming a single-degree-of-freedom fully rotating joint deployable mechanism. The dimensions and number of the equal-sized flower disc, folding rod, and strut are determined by the projection profile, the upper curved surface, and the lower curved surface. The projection profile is obtained by splicing and expanding multiple identical projection basic units along their own base direction and the perpendicular direction of the base. By adjusting the projection profile, the upper curved surface, and the lower curved surface, a parabolic cylindrical antenna device of arbitrary aperture and size can be fitted. This invention has advantages such as single degree of freedom, high modularity, high degree of component commonality, and convenient connection between components. It is easy to process and assemble, and suitable for rapid mass production.

Description

Technical Field

[0001] This invention relates to the field of space deployable antenna manufacturing, and in particular to a parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disc. Background Technology

[0002] Existing on-orbit examples of parabolic cylindrical antennas are all small-aperture antennas, specifically solid-surface and thin-film antennas. Frame-type parabolic cylindrical antennas offer advantages such as high precision, high deployment-to-reception ratio, and ease of large-aperture implementation, leading to a year-on-year increase in demand. In recent years, the significant growth in domestic satellite demand has placed demands on the performance of frame-type parabolic cylindrical antennas, including reliability during deployment, ease of design and fabrication, the ability to achieve ultra-large or even extremely large apertures, and on-orbit surface accuracy.

[0003] To fill the current research gap in parabolic cylindrical antennas, various research institutions in China have successively carried out research on frame-type parabolic cylindrical antennas in recent years. For example, patent CN202111500464.5 proposes a parabolic cylindrical antenna based on triangular prism deployable elements. This antenna uses triangular prism deployable elements to realize the deployment of the antenna structure. The deployed size of the antenna can be expanded by splicing triangular prism deployable elements. This prism element deployment process has many degrees of freedom, and the degree of freedom increases further with the increase of networking elements, which is not conducive to realizing large aperture. In addition, this design cannot completely fit the parabolic cylinder, and its stiffness is not as good as that of pyramidal elements. Patent CN202211222567.4 proposes a single-degree-of-freedom parabolic cylindrical deployable antenna mechanism based on oblique pentahedral element array. Through the combination and size adjustment of multiple elements, the design of a frame-type parabolic cylindrical antenna with arbitrary curvature can be realized. However, the connecting pairs include multiple gimbals and various swivel plates, resulting in a complex configuration and affecting the deployment accuracy. Patent CN202310805707.9 provides a tetrahedral frame deployable parabolic cylindrical mesh antenna. The antenna is composed of multiple tetrahedral units. The vertices of the tetrahedral deployable units are provided with a deployment linkage mechanism. After deployment, it has high rigidity. However, the linkage mechanism contains sliding pairs. As the number of combined units increases, the number of sliding pairs increases. A large number of sliding pairs may cause the deployment process to stagnate, reducing the reliability of deployment.

[0004] In summary, all of the above methods suffer from a trade-off between degrees of freedom and component complexity. To ensure the mechanism fully retracts along the aperture plane, these mechanisms extensively utilize complex kinematic pairs, such as spherical joints and gimbals, reducing the mechanism's deployment accuracy. Furthermore, these pyramidal unit mechanisms generate numerous rods and disc types when fitting parabolic cylinders, further increasing component complexity. Therefore, this invention proposes a parabolic cylindrical antenna device based on a full-rotation joint frame with equal-sized discs. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower plate. By controlling the parameters of the projection surface, the upper curved surface, and the lower curved surface, the positional relationship, quantity, and size parameters of the equal-sized flower plate and folding rod in the upper and lower curved surface deployable mechanisms are obtained respectively. The equal-sized flower plate and folding rod in the upper and lower curved surface deployable mechanisms are identical, resulting in fewer types of parts and a single type of equal-sized flower plate, thus exhibiting excellent interchangeability and versatility. The connections between the equal-sized flower plate, folding rod, and support rod are all rotational connections, thus the obtained motion has unique determinism. The resulting antenna device features a single degree of freedom, a single kinematic pair type, and a high deployment-to-reception ratio, making it easy to achieve large-aperture, high-precision applications and applicable to satellite antennas of various apertures.

[0006] This invention provides a parabolic cylindrical antenna device based on a fully rotating joint frame with equal-sized flower discs. It includes an upper curved deployable mechanism and a lower curved deployable mechanism, which are placed opposite each other and rotatably connected by a strut. Each of the upper and lower curved deployable mechanisms includes an equal-sized flower disc and a folding rod. Adjacent equal-sized flower discs are connected by the folding rod. The rotation axis connecting the equal-sized flower discs and the folding rod is parallel to the projected surface forming the curved deployable mechanism, and the rotation axis is orthogonal to the line connecting the center points of the two adjacent equal-sized flower discs connected by the folding rod. When the upper-level surface developable mechanism is fully unfolded, the center node of the equal-sized flower plate is located within the upper surface of the upper-level surface developable mechanism. When the lower-level surface developable mechanism is fully unfolded, the center node of the equal-sized flower plate is located within the lower surface of the lower-level surface developable mechanism. The lower surface is a parabolic cylinder, the upper surface is a cylinder, and the projection surface is a rectangular plane, which includes multiple identical projection basic units. The projection basic units are spliced ​​and expanded along their own bottom edge direction and the perpendicular direction of the bottom edge to form a projection surface with u rows and v columns, where u and v are both integers greater than or equal to 2. The projection basic unit includes a first unit vertex, a second unit vertex, a third unit vertex, and an interior point. The first unit vertex, the second unit vertex, and the third unit vertex are located at the vertices of the outer shape of the projection basic unit. The interior point is located on the perpendicular bisector of the bottom edge inside the projection basic unit. The first unit vertex, the second unit vertex, and the third unit vertex are projected onto the lower curved surface to obtain the position of the medium-sized flower plate of the lower curved surface developable mechanism. The interior point is projected onto the upper curved surface to obtain the position of the medium-sized flower plate of the upper curved surface developable mechanism. The outer ring of the equal-sized flower disc has six first hinge seats distributed along the circumference, and the inner ring of the equal-sized flower disc has three second hinge seats distributed along the circumference. The height of the first hinge seats and the height of the second hinge seats have a height difference h in the plane normal direction of the equal-sized flower disc. The center of the first hinge seat is located on the plane where the center of the equal-sized flower disc is located, and the radial distance between the center of the first hinge seat and the center of the equal-sized flower disc is r1. The height of the second hinge seats and the height of the first hinge seats have a height difference h in the plane normal direction of the equal-sized flower disc, and the radial distance between the center of the second hinge seat and the center of the equal-sized flower disc is r2.

[0007] Preferably, the folding rod includes a first end hinge, a second end hinge, a first straight rod, a second straight rod, and an eccentric hinge. The first connecting end of the first straight rod is connected to the first end hinge, the second connecting end of the first straight rod is connected to the inner eccentric hinge seat of the eccentric hinge, the outer eccentric hinge seat of the eccentric hinge is connected to the first connecting end of the second straight rod, and the second connecting end of the second straight rod is connected to the second end hinge.

[0008] Preferably, the eccentric hinge includes an inner eccentric hinge seat, an outer eccentric hinge seat, a torsion spring, and a pin. The fixed ends of both the inner and outer eccentric hinge seats are cylindrical plugs. The axial width of the rotating end of the inner eccentric hinge seat is greater than the axial width of the rotating end of the outer eccentric hinge seat. The rotating ends of both the inner and outer eccentric hinge seats are provided with inner cavities with grooves and limiting surfaces. The inner cavity of the rotating end of the inner eccentric hinge seat is connected to the inner cavity of the rotating end of the outer eccentric hinge seat through the torsion spring and the pin. The axis of the cylindrical plug is perpendicular to the rotation axes of the inner and outer eccentric hinge seats, respectively.

[0009] Preferably, the rotation axes of the first end hinge, the second end hinge, and the eccentric hinge of the folding rod are parallel to each other, and the difference in length between the first straight rod and the second straight rod of the folding rod is equal to the difference in length between the support rod on the adjacent side of the first straight rod and the support rod on the adjacent side of the second straight rod of the folding rod.

[0010] Preferably, the support rod includes a straight support rod, a first end hinge, and a second end hinge. The first and second connecting ends of the straight support rod are respectively connected to the first end hinge and the second end hinge. The length of the straight support rod is equal to the distance between the hinge seats in the equally sized flower discs connected to the first and second end hinges of the support rod minus twice the length of the end hinge.

[0011] Preferably, the parabolic cylinder and the straight line direction of the cylinder are parallel to the bottom edge of the projection basic unit.

[0012] Preferably, the surface fitted to the center node of the equal-sized flower plate when the upper surface developable mechanism is fully unfolded is determined by adjusting the projection direction angle of the projection basic unit and the curvature of the upper surface.

[0013] Preferably, the axis connecting the hinge at the first end of the support rod to the medium-sized disc of the upper curved deployable mechanism is parallel to the projection surface forming the upper curved deployable mechanism; the axis connecting the hinge at the second end of the support rod to the medium-sized disc of the lower curved deployable mechanism is parallel to the projection surface forming the lower curved deployable mechanism; the axis connecting the hinge at the first end of the support rod to the medium-sized disc of the upper curved deployable mechanism is orthogonal to the line connecting the inner point of the unit forming the projection surface of the curved deployable mechanism and the vertex of the unit corresponding to the position of the medium-sized disc of the lower curved deployable mechanism; and the axis connecting the hinge at the second end of the support rod to the medium-sized disc of the lower curved deployable mechanism is orthogonal to the line connecting the inner point of the unit forming the projection surface of the curved deployable mechanism and the vertex of the unit corresponding to the position of the medium-sized disc of the lower curved deployable mechanism.

[0014] Preferably, in the unfolded state, the distance between the upper curved surface unfoldable mechanism and the lower curved surface unfoldable mechanism is determined by the distance between the upper curved surface and the lower curved surface, the number of equal-sized flower discs and the position of the equal-sized flower discs are determined by the projected surface, and the folded length is determined by the distance between two adjacent equal-sized flower discs.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The antenna device obtained by splicing together the projection basic unit to form a projection surface, an upper curved surface and a lower curved surface has only one degree of freedom. The upper curved surface deployable mechanism and the lower curved surface deployable mechanism expand and contract synchronously. The expansion process is definite and unique, and no additional conformal mechanism is required. The expansion process is easy to control.

[0017] 2. The antenna device of this invention has the characteristic of completely retracting along the aperture direction, resulting in a large deployment-to-reception ratio. The configuration process is convenient; given the dimensions of the basic projection unit of the projection surface, the number of rows (u) and columns (v), the upper surface, the lower surface, and the projection angle of the basic projection unit, the dimensions of the parabolic cylindrical antenna device can be obtained. By modifying the number of rows (u) and columns (v), parabolic cylindrical antenna devices of different sizes can be obtained. By modifying the lower surface, the reflector of a parabolic cylindrical antenna device with an arbitrary aperture can be fitted. By modifying the upper surface and the projection angle of the basic projection unit, parabolic cylindrical antenna devices with different deployment performance and deployment-to-reception ratios can be obtained to meet various complex engineering requirements.

[0018] 3. The parabolic cylindrical antenna device of the present invention has a single type of parts. The end hinges in the equal-sized disc, support rod and folding rod and the eccentric hinge in the folding rod are all of the same type. The connecting pairs between the equal-sized disc, support rod and folding rod are all rotating pairs. Compared with ball joints and universal joints, they are easier to process and achieve high precision. They are easy to process and assemble and are suitable for rapid mass production. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention;

[0020] Figure 2 This is an unfolded view of the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention.

[0021] Figure 3 This diagram shows the hinge positions of the equal-sized flower disk in the fully rotating joint frame parabolic cylindrical antenna device based on the equal-sized flower disk of the present invention.

[0022] Figure 4 This is a structural diagram of the medium-sized flower disk in the fully rotating joint frame parabolic cylindrical antenna device based on the equal-sized flower disk of the present invention;

[0023] Figure 5 This is a structural diagram of the folding rod in the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disc according to the present invention;

[0024] Figure 6 This is a structural diagram of the eccentric hinge in the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention.

[0025] Figure 7 This is a structural diagram of the strut in the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention;

[0026] Figure 8 This is a semi-developed view of the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention.

[0027] Figure 9 This is a fully collapsed view of the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disc according to the present invention.

[0028] Figure 10 This is a projection profile of the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention.

[0029] Figure 11 This is a diagram showing the projection of the basic unit and the position of the flower disk node in the parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to the present invention.

[0030] Key reference numerals:

[0031] Upper surface developable mechanism 1, lower surface developable mechanism 2, strut 3, strut straight rod 31, strut first end hinge 32, strut second end hinge 33, equal-sized flower plate 4, axis Ai of the first hinge seat (i = 1, 2, 3, 4, 5, 6), axis Bi of the second hinge seat (i = 1, 2, 3), folding rod 5, eccentric hinge 51, inner eccentric hinge seat 511, outer eccentric hinge seat 512, torsion spring 513, folding rod first end hinge 52, folding rod second end hinge 53, folding rod first straight rod 54, folding rod second straight rod 55, projection basic unit 6, first unit vertex 61, second unit vertex 62, third unit vertex 63, unit inner point 64, lower surface f1, upper surface f2. Detailed Implementation

[0032] To fully describe the technical content, structural features, objectives, and effects of this invention, a detailed description will be provided below in conjunction with the accompanying drawings.

[0033] The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk has advantages such as fewer degrees of freedom, fewer kinematic pairs, and a limited variety of flower disks, thus resulting in an optimized antenna device. For example... Figure 1 and Figure 2 As shown, it includes an upper curved surface deployable mechanism 1 and a lower curved surface deployable mechanism 2, which are placed opposite each other. During movement, the folding rod 5 in the upper curved surface deployable mechanism 1 folds downward, and the folding rod 5 in the lower curved surface deployable mechanism 2 folds upward. It is limited when the first straight rod 54 and the second straight rod 55 of the folding rod 5 are collinear. The upper curved surface deployable mechanism 1 is rotatably connected to the lower curved surface deployable mechanism 2 via a support rod 3. The upper curved surface deployable mechanism 1... The antenna device, rotatably connected to the support rod 3 and the lower curved deployable mechanism 2, is a single-degree-of-freedom fully rotating joint deployable device. The deployment process of the antenna device is a single-degree-of-freedom motion. All the equally sized discs 4 of the upper and lower curved deployable mechanisms 1 and 2 move synchronously away, and the torsion springs 513 of the eccentric hinges 51 in all the folding rods 5 deploy synchronously. The relative motion relationships of all the support rods 3, equally sized discs 4, and folding rods 5 inside the antenna device are determined and unique. The deployment drive is the kinetic energy released by each torsion spring 513. Specifically, the dimensions of the upper and lower curved deployable mechanisms 1 and 2 are determined by the projected surface, and the connection method between the support rod 3 and the upper and lower curved deployable mechanisms 1 and 2 is also determined by the projected surface.

[0034] The axis connecting the first end hinge 32 of the strut to the medium-sized flower plate 4 of the upper curved surface developable mechanism 1 and the axis connecting the second end hinge 33 of the strut to the medium-sized flower plate 4 of the lower curved surface developable mechanism 2 are parallel to the projection surface and orthogonal to the line connecting the unit point 64 inside the unit and the unit vertex corresponding to the position projected onto the medium-sized flower plate 4 of the lower curved surface developable mechanism 2.

[0035] The upper-level curved surface developable mechanism 1 and the lower-level curved surface developable mechanism 2 have the same structure, including equal-sized flower discs 4 and folding rods 5. In the upper-level curved surface developable mechanism 1 and the lower-level curved surface developable mechanism 2, two adjacent equal-sized flower discs 4 are connected by folding rods 5. The rotation axis connecting the equal-sized flower discs 4 and the folding rods 5 is parallel to the projected surface, and the rotation axis is orthogonal to the line connecting the center points of the two adjacent equal-sized flower discs 4 connected by the folding rods 5. In the unfolded state, the upper-level curved surface developable mechanism 1 and the lower-level curved surface developable mechanism 2... The distance between them is determined by the distance between the upper curved surface f2 and the lower curved surface f1. The number and position of the equal-sized flower discs 4 are determined by the projection of the projection plane onto the lower curved surface f1 and the upper curved surface f2. The planes on which the equal-sized flower discs are located are parallel to each other. The equal-sized flower discs 4 of the same layer of the surface-deployable mechanism have the same posture. The equal-sized flower discs 4 in the upper curved surface-deployable mechanism 1 and the lower curved surface-deployable mechanism 2 are centrally symmetrical. The length of the folding rod 5 is determined by the distance between two adjacent equal-sized flower discs 4.

[0036] When the upper surface developable mechanism 1 is fully unfolded, the center node of the equal-sized flower plate 4 is located within the upper surface f2. When the lower surface developable mechanism 2 is fully unfolded, the center node of the equal-sized flower plate 4 is located within the lower surface f1. The lower surface f1 is a parabolic cylinder, and the upper surface f2 is a cylinder. The straight lines of the parabolic cylinder and the cylinder are parallel to the bottom edge of the projection basic unit 6, respectively. The straight line of the parabolic cylinder is parallel to the line connecting the second unit vertex 62 and the third unit vertex 63, and the straight line of the cylinder is parallel to the line connecting the second unit vertex 62 and the third unit vertex 63.

[0037] like Figure 10 As shown, the projection surface is a rectangular plane comprising multiple identical projection basic units 6. These 6 basic units are spliced ​​together along their base and perpendicular to the base to form a projection surface with u rows and v columns, where u and v are integers greater than or equal to 2. As the number of projection basic units 6 increases, the aperture of the resulting parabolic cylindrical antenna device increases. Projecting multiple identical projection basic units 6 onto the upper curved surface f1 and the lower curved surface f2 yields... Figure 1 The position of the medium-sized disc 4 in the parabolic cylindrical antenna device shown.

[0038] Projection basic unit 6, such as Figure 11As shown, it includes a first unit vertex 61, a second unit vertex 62, a third unit vertex 63, and an inner point 64. The first unit vertex 61, the second unit vertex 62, and the third unit vertex 63 are located at the vertices of the outer shape of the projection basic unit 6, respectively. The inner point 64 is located on the perpendicular bisector of the bottom edge inside the projection basic unit 6. The first unit vertex 61, the second unit vertex 62, and the third unit vertex 63 are projected onto the lower surface f1 to obtain the position of the medium-sized flower plate 4 of the lower surface developable mechanism 2. The inner point 64 is projected onto the upper surface f2 to obtain the position of the medium-sized flower plate 4 of the upper surface developable mechanism 1.

[0039] like Figure 3 and Figure 4 As shown, the outer ring of the equal-sized flower plate 4 has six first hinge seats distributed along the circumference. The axes of the six first hinge seats are A1, A2, A3, A4, A5, and A6, respectively. The axes A1, A2, A3, A4, A5, and A6 are coplanar with the center node O of the equal-sized flower plate 4 and are used to connect the folding rod 5. The inner ring of the equal-sized flower plate 4 has three second hinge seats distributed along the circumference. The axes of the three second hinge seats are B1, B2, and B3, respectively. The axes B1, B2, and B3 are coplanar and are used to connect the support rod 3. The height difference h between the first hinge seats and the second hinge seats is in the plane normal direction of the equal-sized flower plate 4, which facilitates processing and size adjustment. The height difference h does not affect the degree of freedom of the antenna device. The included angle α between two adjacent first hinge seats, the included angle β between two adjacent second hinge seats, and the included angle γ between adjacent first and second hinge seats in the plane normal direction of the equal-sized flower plate 4 are all determined according to the projection surface. Specifically, the center of the first hinge is located on the plane containing the center of the equal-sized flower plate 4, and the radial distance between the center of the first hinge and the center of the equal-sized flower plate 4 is r1; the height of the second hinge and the height of the first hinge have a height difference h in the plane normal direction of the equal-sized flower plate 4, and the radial distance between the center of the second hinge and the center of the equal-sized flower plate 4 is r2. The first hinge is used to connect the folding rod 5, and the second hinge is used to connect the support rod 3.

[0040] Folding rod 5, such as Figure 5As shown, the folding rod includes a first end hinge 52, a second end hinge 53, a first straight rod 54, a second straight rod 55, and an eccentric hinge 51. The rotational axis C2 of the first end hinge 52, the rotational axis C3 of the second end hinge 53, and the rotational axis C1 of the eccentric hinge 51 are parallel to each other. The first connecting end of the first straight rod 54 is connected to the first end hinge 52, the second connecting end of the first straight rod 54 is connected to the inner eccentric hinge seat 511 of the eccentric hinge 51, the outer eccentric hinge seat 512 of the eccentric hinge 51 is connected to the first connecting end of the second straight rod 55, and the second connecting end of the second straight rod 55 is connected to the second end hinge 53. Specifically, when the axis C2 of the rotation joint of the first end hinge 52 of the folding rod is connected to the axis A1 of the first hinge seat of the equal-sized flower plate 4, the axis C3 of the rotation joint of the second end hinge 53 of the folding rod is connected to the axis A4 of the first hinge seat of the adjacent equal-sized flower plate 4.

[0041] Eccentric hinge 51, such as Figure 6 As shown, the device includes an inner eccentric hinge seat 511, an outer eccentric hinge seat 512, a torsion spring 513, and a pin. The fixed ends of both the inner eccentric hinge seat 511 and the outer eccentric hinge seat 512 are cylindrical plugs. These cylindrical plugs are inserted into the straight rod and fixedly connected using a positioning pin. The axial width of the rotating end of the inner eccentric hinge seat 511 is greater than the axial width of the rotating end of the outer eccentric hinge seat 512. When engaged with the outer eccentric hinge seat 512, the inner wall of the inner eccentric hinge seat 511 fits against the outer wall of the outer eccentric hinge seat 512. The rotating ends of both the inner eccentric hinge seat 511 and the outer eccentric hinge seat 512 are provided with grooved cavities and limiting surfaces. The grooves are used to accommodate the torsion spring rod, converting the potential energy of the torsion spring into unfolding kinetic energy. When the folding rod 513 is unfolded... When the first straight rod 54 and the second straight rod 55 of the folding rod are collinear, the limiting surfaces of the inner eccentric hinge seat 511 and the outer eccentric hinge seat 512 are in contact and restrict the folding rod 5 from continuing to unfold. The inner cavity of the rotating end of the inner eccentric hinge seat 511 is rotatably connected to the inner cavity of the rotating end of the outer eccentric hinge seat 512 through the torsion spring 513 and the pin. The axis of the rotating joint is C1. The cylindrical joint axis D1 of the inner eccentric hinge seat 511 is not coplanar with the rotating joint axis C1 of the torsion spring 513. The cylindrical joint axis D2 of the outer eccentric hinge seat 512 is not located on the same plane as the rotating joint axis C1 of the torsion spring 513. They are in a non-coplanar state to achieve the hinge eccentricity effect and avoid interference problems during the unfolding and retraction of the folding rod.

[0042] Furthermore, to ensure that the antenna device is fully retracted along the aperture direction to maximize the aperture-direction expansion-contraction ratio, the lengths of the first straight folding rod 54 and the second straight folding rod 55 in the folding rod 5 are determined by the lengths of their adjacent support rods 31. The length relationship is as follows: the difference between the lengths of the first straight folding rod 54 and the second straight folding rod 55 is equal to the difference between the lengths of the support rods 31 on the adjacent side of the first straight folding rod 54 and the support rods 31 on the adjacent side of the second straight folding rod 55.

[0043] Support rod 3, such as Figure 7 As shown, it includes a strut 31, a first end hinge 32, and a second end hinge 33. The first and second connecting ends of the strut 31 are connected to the first end hinge 32 and the second end hinge 33, respectively. The rotation axis E1 of the first end hinge 32 is parallel to the rotation axis E2 of the second end hinge 33. The length of the strut 31 is determined based on the parabolic cylindrical surface fitted by the lower curved surface f1, the cylindrical surface fitted by the upper curved surface f2, and the projected surface. The length of the strut 31 is equal to the distance between the hinge seats in the equally sized flower plate 4 connected by the first end hinge 32 and the second end hinge 33 of the strut 3, minus twice the length of the end hinge. The first end hinge 32 of the support rod is embedded in the hinge seat of the equal-sized flower plate 4 of the upper curved surface deployable mechanism 1, so that the rotational joint axis E1 of the first end hinge 32 of the support rod is collinear with the axis B1, B2 or B3 of the second hinge seat of the equal-sized flower plate 4 of the upper curved surface deployable mechanism 1; the second end hinge 33 of the support rod is embedded in the hinge seat of the equal-sized flower plate 4 of the lower curved surface deployable mechanism 2, so that the rotational joint axis E2 of the second end hinge 33 of the support rod is collinear with the axis B1, B2 or B3 of the second hinge seat of the equal-sized flower plate 4 of the lower curved surface deployable mechanism 2.

[0044] Furthermore, in the antenna device of the present invention, the type of equal-sized flower plate 4 and eccentric hinge 51 is unique, and the dimensions of the first end hinge 32 of the support rod, the second end hinge 33 of the support rod, the first end hinge 52 of the folding rod, and the second end hinge 53 of the folding rod are consistent. By changing the projection profile, the upper curved surface f2, and the lower curved surface f1, the lengths of the support rod straight rod 31, the first straight rod 54 of the folding rod, and the second straight rod 55 of the folding rod can be obtained, achieving the fitting of different parabolic cylinders, thereby constructing parabolic cylindrical antenna devices with different apertures and shapes. The projection direction angle between the antenna device profile and the parabolic cylinder directrix is ​​variable, and the curved surface fitted by the center node of the equal-sized flower plate 4 when the upper curved surface deployable mechanism 1 is fully deployed is also variable. By adjusting the projection direction angle of the projection basic unit 6 and the curvature of the upper curved surface f2, the uniformity of the length of the support rod 3 in the antenna device can be changed, thereby meeting the deployment-reception ratio requirements of the antenna device.

[0045] The following describes in further detail an embodiment of the present invention: a parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk.

[0046] In a specific embodiment of the present invention, the first unit vertex 61, the second unit vertex 62, and the third unit vertex 63 of the projection basic unit 6 are first projected onto the lower curved surface f1 to obtain the center nodes of the first equal-sized flower disc 5A, the second equal-sized flower disc 5B, and the third equal-sized flower disc 5C of the lower curved surface developable mechanism 2. The unit interior point 64 of the projection basic unit 6 is then projected onto the upper curved surface f2 to obtain the center node of the fourth equal-sized flower disc 5D of the upper curved surface developable mechanism 1.

[0047] Then, the orientation relationship of the equal-sized flower discs 4 in the upper surface developable mechanism 1 and the lower surface developable mechanism 2 is determined: the first equal-sized flower disc 5A, the second equal-sized flower disc 5B, and the third equal-sized flower disc 5C are located in the lower surface developable mechanism 2, and the three equal-sized flower discs have the same orientation. The fourth equal-sized flower disc 5D is located in the upper surface developable mechanism 1, and is placed opposite the equal-sized flower disc 4 in the lower surface developable mechanism 2. The specific positional relationship is as follows: the axis B1 of the fourth equal-sized flower disc 5D is parallel to the axis B1 of the first equal-sized flower disc 5A, the second equal-sized flower disc 5B, or the third equal-sized flower disc 5C; the axis B2 of the fourth equal-sized flower disc 5D is parallel to the axis B3 of the first equal-sized flower disc 5A, the second equal-sized flower disc 5B, or the third equal-sized flower disc 5C; the axis B3 of the fourth equal-sized flower disc 5D is parallel to the axis B2 of the first equal-sized flower disc 5A, the second equal-sized flower disc 5B, or the third equal-sized flower disc 5C.

[0048] Next, the equal-sized flower discs 4 in the upper curved surface developable mechanism 1 and the lower curved surface developable mechanism 2 are connected by support rod 3. Partial connection relationships are as follows: the fourth equal-sized flower disc 5D is connected to the first equal-sized flower disc 5A via support rod 3, such that the axis E1 of the first end hinge 32 of the support rod 3 coincides with the axis B1 of the second hinge seat in the fourth equal-sized flower disc 5D; the axis E2 of the second end hinge 33 of the support rod 3 coincides with the axis B1 of the second hinge seat in the first equal-sized flower disc 5A. These axes are parallel to the projected surface and orthogonal to the line connecting the inner point 64 of the unit and the vertex 61 of the first unit. The fourth equal-sized flower disc 5D is connected to the second equal-sized flower disc 5B via support rod 3, such that the axis E1 of the first end hinge 32 of the support rod 3 coincides with the axis B1 of the second hinge seat in the first equal-sized flower disc 5A. The axis B3 of the second hinge seat in the fourth equal-sized flower plate 5D coincides with the axis E2 of the second end hinge 33 of the support rod 3 and the axis B2 of the second hinge seat in the second equal-sized flower plate 5B. The above axes are parallel to the projection surface and orthogonal to the line connecting the inner point 64 of the unit and the vertex 62 of the first unit. The fourth equal-sized flower plate 5D and the third equal-sized flower plate 5C are connected by the support rod 3, such that the axis E1 of the first end hinge 32 of the support rod 3 coincides with the axis B2 of the second hinge seat in the fourth equal-sized flower plate 5D, and the axis E2 of the second end hinge 33 of the support rod 3 coincides with the axis B3 of the second hinge seat in the third equal-sized flower plate 5C. The above axes are parallel to the projection surface and orthogonal to the line connecting the inner point 64 of the unit and the vertex 63 of the first unit.

[0049] Finally, when multiple basic projection units 6 are spliced ​​together and projected, there will be a situation where the splicing nodes share a single equal-sized flower disc 4. After the multiple basic projection units 6 complete the projection, the number and position of the equal-sized flower disc 4 in the upper curved surface mechanism 1 and the lower curved surface mechanism 2 are determined respectively. The equal-sized flower discs 4 in the same curved surface mechanism are all rotatably connected by folding rods 5.

[0050] In this specific embodiment, the projection basic unit 6 can be a triangle or a rectangle, and the projection direction angle δ of the parabolic cylindrical antenna device formed by the above method is variable between its surface and the parabolic cylindrical directrix, and the upper curved surface f2 is also variable. By adjusting the projection direction angle δ and the curvature of the upper curved surface f2, the uniformity of the length of the support rod 31 in the parabolic cylindrical antenna device can be changed, thereby meeting the antenna device's deployment-reception ratio requirements.

[0051] The parabolic cylindrical antenna device obtained above is then unfolded and retracted, as follows: Figure 8The diagram shows the unfolding process of the parabolic cylindrical antenna device of the present invention. The unfolding process is a single-degree-of-freedom motion. All the equal-sized flower discs 4 of the upper curved surface unfoldable mechanism 1 and the lower curved surface unfoldable mechanism 2 move away synchronously. The torsion springs 513 in the eccentric hinges 51 of all the folding rods 5 unfold synchronously. The relative motion relationship between all the support rods 3, equal-sized flower discs 4 and folding rods 5 inside the antenna device is determined and unique. The unfolding drive is the kinetic energy released by each torsion spring 513. Figure 9 This is the retracted state of the parabolic cylindrical antenna device of the present invention. The retracting process is the reverse of the unfolding process.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disc, comprising an upper curved deployable mechanism and a lower curved deployable mechanism, wherein the upper and lower curved deployable mechanisms are placed opposite each other and rotatably connected by a strut, characterized in that, The upper and lower curved surface developable mechanisms each include an equal-sized flower disc and a folding rod. Two adjacent equal-sized flower discs are connected by the folding rod. The rotation axis connecting the equal-sized flower disc and the folding rod is parallel to the projected surface forming the curved surface developable mechanism. The rotation axis is orthogonal to the line connecting the center points of the two adjacent equal-sized flower discs connected by the folding rod. When the upper surface developable mechanism is fully unfolded, the center node of the equal-sized flower plate is located within the upper surface of the upper surface developable mechanism. When the lower surface developable mechanism is fully unfolded, the center node of the equal-sized flower plate is located within the lower surface developable mechanism. The lower surface is a parabolic cylinder, the upper surface is a cylinder, and the projection surface is a rectangular plane, which includes multiple identical projection basic units. The projection basic units are spliced ​​and expanded along their own bottom edge direction and the perpendicular line direction of the bottom edge to form a projection surface with u rows and v columns, where u and v are both integers greater than or equal to 2. The projection basic unit includes a first unit vertex, a second unit vertex, a third unit vertex, and an internal point. The first unit vertex, the second unit vertex, and the third unit vertex are located at the vertices of the outer shape of the projection basic unit. The internal point is located on the perpendicular bisector of the bottom edge inside the projection basic unit. The first unit vertex, the second unit vertex, and the third unit vertex are projected onto the lower curved surface to obtain the position of the medium-sized flower plate of the lower curved surface developable mechanism. The internal point is projected onto the upper curved surface to obtain the position of the medium-sized flower plate of the upper curved surface developable mechanism. The outer ring of the equal-sized flower disc has six first hinge seats distributed along the circumference, and the inner ring of the equal-sized flower disc has three second hinge seats distributed along the circumference. The center of the first hinge seat is located on the plane where the center of the equal-sized flower disc is located, and the radial distance between the center of the first hinge seat and the center of the equal-sized flower disc is r1. The height difference h between the height of the second hinge seat and the height of the first hinge seat is in the plane normal direction of the equal-sized flower disc, and the radial distance between the center of the second hinge seat and the center of the equal-sized flower disc is r2. The folding rod includes a first end hinge, a second end hinge, a first straight rod, a second straight rod, and an eccentric hinge. The first connecting end of the first straight rod is connected to the first end hinge, the second connecting end of the first straight rod is connected to the inner eccentric hinge seat of the eccentric hinge, the outer eccentric hinge seat of the eccentric hinge is connected to the first connecting end of the second straight rod, and the second connecting end of the second straight rod is connected to the second end hinge. The eccentric hinge includes an inner eccentric hinge seat, an outer eccentric hinge seat, a torsion spring, and a pin. The fixed ends of both the inner and outer eccentric hinge seats are cylindrical plugs. The axial width of the rotating end of the inner eccentric hinge seat is greater than the axial width of the rotating end of the outer eccentric hinge seat. The rotating ends of both the inner and outer eccentric hinge seats are provided with inner cavities with grooves and limiting surfaces. The inner cavity of the rotating end of the inner eccentric hinge seat is connected to the inner cavity of the rotating end of the outer eccentric hinge seat through the torsion spring and the pin. The axis of the cylindrical plug is perpendicular to the rotation axes of the inner and outer eccentric hinge seats, respectively. All connecting pairs between the equal-sized flower plate, support rod, and folding rod are revolute joints.

2. The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to claim 1, characterized in that, The rotation axes of the first end hinge, the second end hinge, and the eccentric hinge of the folding rod are parallel to each other. The difference in length between the first straight rod and the second straight rod of the folding rod is equal to the difference in length between the support rod on the adjacent side of the first straight rod and the support rod on the adjacent side of the second straight rod of the folding rod.

3. The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to claim 1, characterized in that, The support rod includes a straight support rod, a first end hinge, and a second end hinge. The first and second connecting ends of the straight support rod are respectively connected to the first end hinge and the second end hinge. The length of the straight support rod is equal to the distance between the hinge seats in the equally sized flower discs connected to the first and second end hinges of the support rod minus twice the length of the end hinge.

4. The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to claim 1, characterized in that, The parabolic cylinder and the straight line direction of the cylinder are parallel to the bottom edge of the basic projection unit, respectively.

5. The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to claim 1 or 4, characterized in that, When the upper surface developable mechanism is fully unfolded, the surface fitted by the center node of the equal-sized flower plate is determined by adjusting the projection direction angle of the projection basic unit and the curvature of the upper surface.

6. The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to claim 1, characterized in that, The axis connecting the hinge at the first end of the support rod to the medium-sized disc of the upper curved deployable mechanism is parallel to the projection surface forming the upper curved deployable mechanism. The axis connecting the hinge at the second end of the support rod to the medium-sized disc of the lower curved deployable mechanism is parallel to the projection surface forming the lower curved deployable mechanism. The axis connecting the hinge at the first end of the support rod to the medium-sized disc of the upper curved deployable mechanism is orthogonal to the line connecting the inner point of the unit forming the projection surface of the curved deployable mechanism and the vertex of the unit corresponding to the position of the medium-sized disc of the lower curved deployable mechanism. The axis connecting the hinge at the second end of the support rod to the medium-sized disc of the lower curved deployable mechanism is orthogonal to the line connecting the inner point of the unit forming the projection surface of the curved deployable mechanism and the vertex of the unit corresponding to the position of the medium-sized disc of the lower curved deployable mechanism.

7. The parabolic cylindrical antenna device based on a fully rotating joint frame with an equal-sized flower disk according to claim 1, characterized in that, In the unfolded state, the distance between the upper curved surface unfoldable mechanism and the lower curved surface unfoldable mechanism is determined by the distance between the upper curved surface and the lower curved surface. The number and position of the equal-sized flower discs are determined by the projected surface. The folded length is determined by the distance between two adjacent equal-sized flower discs.

Images